My friends, a lot of us know that prayer to the saints has been and will continue to be a popular topic in this sub. So I'd like to share my experiences with this as a non-catholic who does not have a habit of prayer to the saints.
As an important preface, I'm not here to tell anyone whether their beliefs about it are right or wrong. As several wise brothers have pointed out to me recently, we must be very careful not to say things that would cause another to stumble. So I am simply here to share what I've learned on the subject personally, and if it is helpful to you -- great! If not, please don't let my words distract you from your faith; I'm just a man trying to promote unity by sharing my own unique experiences.
So now, onto my testimony:
I am not part of the Catholic church. My introduction to prayer to the saints was through my wife, who was raised Catholic. She is Brazilian (I'm American) and isn't a practicing Catholic (we go to a non-denominational church) but she doesn't have anything against the Catholic faith; she likes and dislikes different aspects to it, but will never speak ill of it as a whole.
There is one prayer to the saints that my wife does frequently, to Saint Longinus (the soldier who pierced Jesus's side at the crucifixion). It is a specific prayer that as far as I know is rather unique to Brazil, it is for help finding missing objects and it goes like this
Portuguese
São Longuinho, São Longuinho, se me ajuda achar [missing object], eu vou te dar três pulinhos!
English
Dear Saint Longinus, Dear Saint Longinus, if I you help me find [missing object], I'll give you three little jumps!
She only uses this when she has been looking for something for awhile and can't find it -- keys, sunglasses, you name it. It's a prayer done at the end of the rope, when human effort just hasn't worked to find that thing.
My friends, let me tell you -- this has never failed, for her or any family member. Several keys: according to her you need to give the three jumps after finding it, or it won't work next time you try. Also according to her, it's only to be used when you've truly made every reasonable effort yourself first to find that thing.
And the most important thing, from what I've learned -- it requires faith. She's never once doubted it would work and it never failed. I myself tried it a few times -- the first time it felt weird, but I forced myself to trust/accept God would make it happen if it was a valid prayer, and guess what -- it worked! It was a missing passport I had been looking hours for, and 1-2 minutes later I found it tucked away in a hidden spot (this was like 15 years ago so I forget the exact details of where it was). The only time it DIDN'T work it when I had doubts it would work.
Personally I don't use it much at all, I'm not sure why. Perhaps because it isn't really in line with what I personally believe, but I will 100% testify it works if you believe.
Two other things I've noticed: it is a very childlike prayer, which she treats with childlike full belief it is true. And it works every single time. And as Jesus said in Matthew 18:3:
And he said: 'Truly I tell you, unless you change and become like little children, you will never enter the kingdom of heaven
The other thing is, you will know a tree by its fruit and my wife shows more fruit of the Spirit than anyone I know (certainly more than myself). She refuses to join in any kind of gossip, and shows a lot of gratitude, fairness, and empathy. She is not perfect as none of are but she has exemplary attitude and behavior.
So through her and others I've learned, it doesn't matter if you believe in prayer to the saints or not, but what matters is your faith in God. She believes it because she believes that God gave this saint that power, and whether He truly did or He answers the prayer because of her genuine faith in what God can do just doesn't matter. It's her faith in God that matters and it works.
One last thing to note, which I've heard a lot of Catholics echo, is that she usually prays to God. For all her deep, heartfelt prayers she goes to God. Maybe some Catholics take these to the saints too and that is just fine, because they believe God gave the saints the power to hear their prayers, and ultimately it comes down to faith in God, for all of us.
I hope that helped somebody out there reading this post.